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The nonlinear theory for sediment ripple dynamic process of straight river

Science China(Technological Sciences) 2012年第3期55卷 753-771页

作者： XU HaiJue BAI YuChuan State Key Laboratory of Hydraulic Engineering Simulation and Safety Tianjin UniversityTianjin 300072China Institute for Sedimentation on river and Coastal Engineering Tianjin UniversityTianjin 300072China

There are various sand tipples in the natural world. The viewpoint of Yalin is that local disturbances result in laminar instability and in sand-tipple formation, namely, local disturbance^the instability of the laminar flow→the formation of sand ripples. Based on this viewpoint, a theoretical model of the resonant triad interaction and its nonlinear interaction with the sediment is established. The purpose of this model is to explain the formation and evolution of the sand-tipple and allow for analysis of the instability of open-channel flow caused by it and sand-tipple hydro-dynamic process. This model will not only pave a road to explore the mechanism of interaction between bed-form and turbulence, but also provide a good base for the study of aeolian sand-tipple formation.

关键词： straight river bed-forms symmetric sand-ripples perturbation method nonlinearity

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straight river: its formation and speciality

引用

Journal of Geographical Sciences 2002年第1期12卷 72-80页

作者： WANG Sui-ji1, NI Jin-ren2 (1. Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China 2. Center for Environmental Science, Peking University, Beijing 100871, China) CAS Institute of Geographic Sciences and Natural Resources Research Beijing China (GRID:grid.9227.e) (ISNI:***) Peking University Center for Environmental Science Beijing China (GRID:grid.11135.37) (ISNI:***)

straight river is generally regarded as one of the typical river patterns in conventional classifications in terms of their channel plain landforms. However, very few straight patterns were found to be distributed in wider spatial and temporal spans in the self-adjusted fluvial rivers. Thus, the questions occur such as that is it possible for a channel takes on a stable straight pattern? What are the main factors controlling the processes of the river pattern formation and transformation from a straight to other patterns? Various theories and hypotheses including geomorphic threshold hypothesis, the extreme hypothesis on energy dissipation rate, the stability theory, etc. have been developed to explain the aforementioned questions, but none of them is sound for the explanation to the straight-river formation. From the modern fluvial plain patterns, the straight patterns are not as stable as other typical patterns which occurred in nature; from the historic records of the river sedimentation, no apparent evidence was found to support the stable straight river evolution. Based on the analysis of existing theories, observations, evolvement processes of the channel patterns in the experimental results, this paper concluded that the straight pattern should not be included as one of the typical patterns that are self-formed and developed. This study is of importance to understanding of the river pattern formation and transformation.

关键词： straight river formation cause evolvement sedimentation

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